Mechanical movement



(No Model.)

E. ANDERSON.

MECHANICAL MOVEMENT.

No. 271,295. Patented Jen.30188'3.

A nlhhhhhhhhh Ulllllll D/ If Cf e UNITED STATES PATENTY OFFICE.

EUOLID ANDERSON, OF PEEKSKILL, NEW YORK.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 271,295, dated January 30, 1883. Application filed November 21, 1882. (No model.)

To all whom it may concern:

Be it known that I, EUcLrD ANDERSON, of Peekskill, county of Westchester and State of New York, have invented a new and useful form of Mechanical Movement, which is fully set forth in the following specification.

This invention relates to a combination ot a screw and differential gear, whereby either a rapid or a very slow movement of the screw through its nut may at will be effected.

The object of the invention is to make coinpact and simple the mechanism by which 'the above result is obtained.

rlhe movement iscapable of a variety oiapplications, among which may be named the screw-feed ot' a drill or lathe, the screw ot' a letter-press, and in many places where a slow and powerful movement of a screw in one direction and a rapid movement in the opposite direction are desired.

1n the drawings, Figure l is a side elevation of a device embodying this invention. Fig. 2 is a partly elevation as Fig. l.

Fig. 3 islan end view ot' the gearing.

B B .is a frame, consisting of a base andv two standards. O and l) are toothed wheels, each having a bearing in one of the standards, the bearings being so placed that the axes of both wheels coincide. The wheel D is hollow and threaded, so as to receive the screw A, the wheel forming a nut to the latter. 'lhe wheel O is also hollow, but suijciently large to pass freely over the thread of the screw-A. This wheel is provided with a feather, c, that enters a groove, a, on the screw, so

thatV one cannot turn without turning the other, yet allows ot' a free longitudinal movement ot' the screw through the wheel. The screw is turned by the crank k, or it may be driven by the wheel O. The toothed portions ofthe wheels O and D are of the same diameter and lie adjacent to each other, as shown, and both engage with a pinion, E, whose width equals the width ot' both O and D. E revolves on the stationary pin e, which is supported by the standard B. It can be seen, now, that if C and D contain an equal number of teeth, and they engage with E, revolutions ofthe crank will rnot move the screw A either way in the nut D', but if the wheel D is made to contain one tooth less than O it will have a retrograde movement in relation to C, and

sectional. view of the same' the screw will be slowly moved to the left or the right, according to the direction of rotation ot' screw. rThe pinion E is made capable ot' a longitudinal movement on its support e, so that it may be thrown out of gear with one ofthe wheels, O, and just as it becomes-disengaged with C it engages with and is locked nby the stationary pin f, which enters cavity `g.V ln this position of the parts the wheel (l alone can revolve when the screw is turned, and as the wheel D, forming the nut, is held stationary, the screw is moved a distance equal to its pitch at every revolution. -It' the wheel O contains twenty-four teeth and D twentythree teeth, each turn ofthe screw, when both wheels engage with the pinion, will Ladvance it only the twenty-fourth part of its pitch.

Evidently the number ot teeth can be so iu-v creased as to give a very much finer movement of the screw, or lessened to give a coarser movement than here shown. A diilerence of oneor two teeth in the wheels does not materially interl'ere with their engaging with the pinion E. The pinion may be shifted back and forth in various well-known ways.

It can now be seen that the principle of this device is capable of many applications.' .ln a letter-press, before referred to, E and O would be disengaged until the moment pressure was wanted; then by throwing in the pinion great pressure, with even a short crank, could be obtained. As a drill-feed, the pinion would `be in gear with O while drilling, but out of gear when withdrawing the drill, 85e.

I am aware that differential gearing of the character shown is no new thing.

l., The combination of the differential gearing O D E, the nut D', and screw A., all operating together substantially as shown and described. Y

`2. In combination, the differential gearing consisting ot the wheel (l. having a feather, c, or other suitable device, to insure its revolving with the screw, the wheel D, the hub of which is threaded, the pinion E, capable of a sliding movement, as described, and Ithe screw A, fitting into the nut D', substantially as shown and described.

' EUOLID ANDERSON. Witnesses:

FRANKLIN CoUcH, D. W'. TRAVIS.

IOO 

